CN112564055A - Shock wave back locking protection device of enclosed bus - Google Patents
Shock wave back locking protection device of enclosed bus Download PDFInfo
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- CN112564055A CN112564055A CN202011366943.8A CN202011366943A CN112564055A CN 112564055 A CN112564055 A CN 112564055A CN 202011366943 A CN202011366943 A CN 202011366943A CN 112564055 A CN112564055 A CN 112564055A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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Abstract
The invention provides a shock wave back-locking protection device of a closed bus, which comprises a microprocessor, a shock wave signal generation module and a trip coil driving module, wherein the microprocessor is connected with the shock wave signal generation module; the output end of the shock wave signal generation module is connected with the input end of the microprocessor, and the output end of the microprocessor is connected with the input end of the trip coil driving module and used for controlling the power supply incoming line of the power supply for supplying power to the bus to be electrified through the trip coil driving module; the invention has the beneficial effects that: firstly, the method comprises the following steps: all power supply inlet wires are tripped, so that the 5-step accident evolution model in the background technology is prevented from occurring, and a large amount of equipment and power transformers connected on the bus are prevented from being burnt in a fire-burning and multi-wiring mode; secondly, the method comprises the following steps: the speed of fault removal is much faster than the conventional method because of no delay associated with other protection.
Description
Technical Field
The invention relates to the field of power supply safety, in particular to a shock wave back-locking protection device of a closed bus.
Background
At present, the urban and rural 110Kv and the following transformer substations in China generally adopt a closed bus structure, and as shown in figure 1, the transformer substations have the following remarkable characteristics:
(1) the low-voltage side bus bar penetrates through the whole closed high-voltage switch cabinets 2 which are arranged in rows;
(2) blast shock waves of different degrees are caused by the following three main reasons, and damage to the insulation of power elements causes short circuits.
cause 4, inter-phase short-circuit discharge occurs due to various causes to generate a shock wave.
(3) The low-voltage side bus protection of the transformer 1 is not provided, and when the low-voltage bus is short-circuited, the fault is removed by a backup protection module of the transformer 1;
as shown in fig. 1, 2 and 3: the working principle of the backup protection module of the transformer 1 is as follows: detecting whether fault current exists on the low-voltage side of the transformer 1 through a CT (current transformer) arranged on the low-voltage side of the transformer 1, if fault current exists on any one phase or multiple phases of three-phase lines (A, B, C) on the low-voltage side of the transformer 1, at least two current relays LJ _ A, LJ _ B, LJ _ C arranged on a CT winding are electrified, so that normally open contacts (LJ _ a, LJ _ b and LJ _ C which are not marked in the figure) corresponding to the LJ _ A, LJ _ B, LJ _ C are closed, further, a coil ZJ of an intermediate relay is electrified to cause a first normally open contact ZJ _1 and a second normally open contact ZJ _2 of the intermediate relay to be closed, further, the coil SJ of the time relay is electrified to enter a time delay state, when the time delay state lasts to a preset time 1.5s, the normally open contact SJ _1 of the time relay is closed, a trip coil TQ is electrified, and a breaker DL _ G (or/and/or a breaker DL _ D) is opened, the circuit is powered off, and the bus cabinet and equipment in the cabinet are prevented from being damaged;
in the action process of the backup protection module of the transformer 1, the backup protection module of the transformer 1 detects that short-circuit current exists on the outgoing line side of the transformer 1 from the CT, and the reason that the breaker DL _ G or/and the breaker DL _ D do not trip immediately and trip after 1.5s of delay is that: as shown in fig. 1, no matter the F point in the bus bar room 3 is short-circuited or the FL point on the lower-stage circuit is short-circuited, the short-circuit current appears on the outgoing line side of the transformer 1, and if the FL point on the lower-stage circuit appears short-circuit current at a certain time, if the circuit breaker DL _ G or/and the circuit breaker DL _ D immediately trips, all other lower-stage circuits are powered off, which causes unnecessary loss and negative effects; therefore, after the transformer 1 backup protection module detects that short-circuit current exists on the outgoing line side of the transformer 1, the short-circuit current is not immediately tripped, the time is delayed for 1.5s, within 1.5s of time delay, the protection module arranged on the lower-stage circuit breaker (DL _1, DL _2 and DL _3 … … DL _ n) judges whether the short-circuit condition occurs in the lower-stage circuit or not, if the short-circuit condition occurs in the lower-stage circuit, the corresponding breaker DL _3 on the lower-stage circuit trips, at the moment, the short-circuit current detected by the transformer 1 backup protection module disappears, further, a normally open contact SJ _1 of the time relay is powered off due to a coil SJ thereof, the normally open contact SJ _1 cannot be closed after 1.5s, and the breaker DL _ G or \ and the breaker DL _ D; if the short-circuit point is on the bus and the lower-level circuit, the short-circuit current cannot disappear, after 1.5s, the normally open contact SJ _1 of the time relay is closed, the transformer 1 backup protection module enables the tripping coil TQ to be electrified through the SJ _1 and ZJ _2, and then the circuit breaker DL _ G or/and the circuit breaker DL _ D are tripped, so that the expansion of burning accidents of equipment in the bus cabinet is prevented.
Summarizing a large number of 110Kv and the following closed bus accidents which occur in recent years, the following 5-step accident evolution model is found to exist:
1: one element in the bus cabinet discharges or explodes to generate shock waves;
2: the shock wave damages the insulation of other electrified elements in the cabinet, and the other electrified elements explode in sequence under the action of high voltage and large current;
3: shock waves generated by each explosion are superposed to rapidly worsen the accident;
4: the equipment in the 'fire burning and continuous operation' type is burnt out, even the protection power supply of all the equipment is burnt out, so that the total station protection is out of order;
5: if the transformer 1 protection power supply is burnt before the step 4, the backup protection module of the transformer 1 fails, and the transformer 1 is difficult to be burnt; if the transformer 1 protection power supply is not burnt, the tripping time is more than 1.5 seconds because the fault point is within the protection range of the transformer 1 backup protection module, and at the moment, the transformer 1 bears the impact of long-time short-circuit current and can be seriously damaged if not being burnt completely.
Combining the 5-step accident evolution model, the main problems of the 5-step accident evolution model are found as follows:
the bus in the high-voltage switch cabinet 2 is not provided with a protection device, so that when a single element (PT, CT, a lightning arrester and the like) in the cabinet discharges or explodes, a backup protection module of the transformer 1 is needed to take out short-circuit current and then delay tripping is carried out. However, in the time-delay process, a "fire running" is often caused, that is, all the circuit breakers and other devices in all the switch cabinets connected by the bus are burnt. If the protection power supply of the transformer 1 is damaged in the fire burning continuous operation accident, the backup protection module of the transformer 1 does not act, and the transformer 1 is inevitably burnt; however, if the backup protection module of the transformer 1 is directly tripped without delay, all subordinate lines are unnecessarily powered off, and economic loss and social dissatisfaction are caused; the above problems have plagued the power industry for many years and become an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a shock wave anti-lock protection device for a closed bus, which can directly judge whether an explosion fault occurs in a bus chamber or not by utilizing a first shock wave signal generated by explosion of a first element in the bus chamber of a high-voltage switch cabinet, and immediately trip a circuit breaker DL _ D and all power incoming line circuit breakers connected to the bus, so that the situations of transformer burnout and fire continuous operation caused by too long delay of a transformer backup protection module are prevented.
In order to achieve the purpose, the invention adopts the following technical scheme:
the shock wave anti-locking protection device of the closed bus comprises a microprocessor, a shock wave signal generation module and a trip coil driving module; the output end of the shock wave signal generation module is connected with the input end of the microprocessor, and the output end of the microprocessor is connected with the input end of the trip coil driving module and used for controlling the power supply incoming line of the power supply for supplying power to the bus to be electrified through the trip coil driving module;
the shock wave signal generation module comprises a signal generation power supply, a signal acquisition mechanism, a first power-off delay relay, a second power-off delay relay, a first optical coupler, a second optical coupler, a first signal processing mechanism and a second signal processing mechanism; the signal acquisition mechanism comprises two groups of shock wave sensors which are arranged in the high-voltage switch cabinet, wherein the two groups of shock wave sensors comprise a plurality of shock wave sensors with the same number, the two groups of shock wave sensors are respectively arranged on the inner walls of a bus chamber of the high-voltage switch cabinet in two opposite directions, and the induction ends of the two groups of shock wave sensors are arranged oppositely; the first end of the first group of shock wave sensors after being connected in parallel is electrically connected with the anode of the signal generating power supply, the second end of the first group of shock wave sensors after being connected in parallel is electrically connected with the optical coupler light-emitting device and the first resistor of the first optical coupler in sequence and the cathode of the signal generating power supply, the first end of the coil of the first power-off time delay relay is electrically connected with the anode of the signal generating power supply, the second end of the coil of the first power-off time delay relay is electrically connected with the cathode of the signal generating power supply in sequence through the optical coupler light-receiving device and the first resistor of the first optical coupler, the first end of the second group of shock wave sensors after being connected in parallel is electrically connected with the anode of the signal generating power supply, the second end of the second group of shock wave sensors after being connected in parallel is electrically connected with the optical coupler light-emitting device and the second resistor in sequence through the second optical coupler and the cathode of the signal generating, the second end of the coil of the second power-off delay relay sequentially passes through the optical coupler light receiver of the second optical coupler and the second resistor and is electrically connected with the negative electrode of the signal generation power supply, the normally open contact of the coil of the first power-off delay relay is electrically connected with the positive electrode of the signal generation power supply, the second end of the normally open contact of the first power-off delay relay is connected with the input end of the microprocessor through the first signal processing mechanism, the normally open contact of the coil of the second power-off delay relay is electrically connected with the positive electrode of the signal generation power supply, the second end of the normally open contact of the second power-off delay relay is connected with the input end of the microprocessor through the second signal processing mechanism, and the first signal processing mechanism and the second signal processing mechanism both adopt an A/D (analog/digital).
And the delayed power-off time of the first power-off delay relay and the second power-off delay relay is 0.3 s.
The shock wave signal generation module further comprises a first signal conditioning mechanism and a second signal conditioning mechanism; the second end of the normally open contact of the first power-off delay relay is connected with the first signal processing mechanism through the first signal conditioning mechanism, the second end of the normally open contact of the second power-off delay relay is connected with the second signal processing mechanism through the second signal conditioning mechanism, and the first signal conditioning mechanism and the second signal conditioning mechanism are composed of a filter circuit, an amplifying circuit and a shaping circuit which are sequentially connected.
The tripping coil driving module adopts a relay coil driving circuit.
The microprocessor adopts a singlechip, a PLC or an IP core of intellectual property rights.
The invention has the beneficial effects that:
firstly, the method comprises the following steps: when the bus fails, all power incoming line circuit breakers on the bus are immediately tripped, and the bus protection device is not only a transformer low-voltage outgoing line circuit breaker in a single power supply mode, and is suitable for bus protection in a multi-power bus power supply mode;
secondly, the method comprises the following steps: all power supply inlet wires are tripped, so that the 5-step accident evolution model in the background technology is prevented from occurring, and a large amount of equipment and power transformers connected on the bus are prevented from being burnt in a fire-burning and multi-wiring mode;
thirdly, the method comprises the following steps: because the time delay is not needed to be matched with other protection, the fault removing speed is much faster than that of the traditional method;
fourthly: utilize first time delay disconnection relay and second time delay disconnection relay to make still keep 0.3 seconds effective after the shock wave signal disappears, even when the shock wave signal reachd the shock wave sensor of second group, the signal on the first group shock wave sensor has ended, also can guarantee that all power inlet wire breakers connected on the generating line also can normally trip.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a backup protection module of a transformer;
FIG. 2 is a schematic diagram of a transformer backup protection module;
FIG. 3 is a schematic diagram of the principle of detecting a fault current on the low-voltage side of a transformer by using a current transformer;
FIG. 4 is a schematic structural diagram of a signal acquisition mechanism according to the present invention;
FIG. 5 is a schematic diagram of the principles of the present invention;
fig. 6 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 4, 5 and 6: the invention relates to a shock wave back-locking protection device of a closed bus, which comprises a microprocessor, a shock wave signal generation module and a trip coil driving module; the output end of the shock wave signal generation module is connected with the input end of the microprocessor, the output end of the microprocessor is connected with the input end of the trip coil driving module, and the trip coil driving module is used for controlling the energization of a trip coil TQ of a power supply incoming line for supplying power to a bus so as to enable all power supply incoming line circuit breakers connected to the bus to trip simultaneously; it should be noted that the power supply connected to the bus for supplying power to the bus may not be only one power supply on the high-voltage side of the transformer, but also other power supplies may be provided on the lower-level line, and the disconnection of each power supply incoming line is controlled by the trip coil TQ of the corresponding circuit breaker, as shown in fig. 6: the first lower line is provided with a power supply, and the trip coil TQ on the first lower line controls the power supply to be disconnected through the corresponding breaker DL _ 1.
The shock wave signal generating module comprises a signal generating power supply, a signal collecting mechanism, a first power-off delay relay, a second power-off delay relay, a first optical coupler Oc1, a second optical coupler Oc2, a first signal processing mechanism and a second signal processing mechanism; the signal acquisition mechanism comprises two groups of shock wave sensors which are arranged in the high-voltage switch cabinet, wherein the two groups of shock wave sensors comprise a plurality of shock wave sensors with the same number, the two groups of shock wave sensors are respectively arranged on the inner walls of a bus chamber of the high-voltage switch cabinet in two opposite directions, and the induction ends of the two groups of shock wave sensors are arranged oppositely; the first ends of the first group of shock wave sensors (Da 1, Da2 … Dan) which are connected in parallel are electrically connected with the anode of a signal generating power supply, the second ends of the first group of shock wave sensors (Da 1, Da2 … Dan) which are connected in parallel are electrically connected with the cathode of the signal generating power supply through the optical coupler light-emitting device of the first optical coupler Oc1 and the first one-to-one resistor R11 in sequence, the first end of the coil Da of the first power-off delay relay is electrically connected with the anode of the signal generating power supply, the second end of the coil Da of the first power-off delay relay is electrically connected with the cathode of the signal generating power supply through the optical coupler light-receiving device of the first optical coupler Oc1 and the first two resistors R12 in sequence, the first ends of the second group of shock wave sensors (Db 1, Db2 … Dbn) which are connected in parallel are electrically connected with the anode of the signal generating power supply, the second ends of the second group of shock wave sensors (Db 1, Db2 … Dbn) which are connected in parallel are electrically connected with the cathode of the optical coupler light-emitting, the first end of the coil Db of the second power-off delay relay is electrically connected with the anode of the signal generating power supply, the second end of the coil Db of the second power-off delay relay is electrically connected with the cathode of the signal generating power supply sequentially through the optical coupler light-receiving device of the second optical coupler Oc2 and the second resistor R22, the first end of the normally open contact Das of the first power-off delay relay is electrically connected with the anode of the signal generating power supply, the second end of the normally open contact Das of the first power-off delay relay is connected with the input end of the microprocessor through the first signal processing mechanism, the first end of the normally open contact Dbs of the second power-off delay relay is electrically connected with the anode of the signal generating power supply, and the second end of the normally open contact Dbs of the second power-off delay relay is connected with the input end of the microprocessor through the second signal processing mechanism, the first signal processing mechanism and the second signal processing mechanism both adopt A/D conversion circuits.
The working principle of the shock wave back-locking protection device for the enclosed bus is as follows:
it is first noted that: when shock waves are generated in the bus chamber of the high-voltage switch cabinet, the fact that problems occur in the bus chamber of the high-voltage switch cabinet is shown, at the moment, whether the problems occur in the lower circuit is not judged through a protection module arranged on a lower circuit breaker (DL _1, DL _2 and DL _3 … … DL _ n), the time of 1.5s of time delay of a time relay in a backup protection module of a transformer 1 is skipped, a trip coil TQ is immediately electrified, and the tripping is carried out to prevent the bus cabinet and equipment in the cabinet from being further damaged.
In the invention, once the bus chamber of the high-voltage switch cabinet generates shock waves, the shock wave sensor arranged in the high-voltage switch cabinet can acquire shock wave signals; because the shock wave is generated in the high-voltage switch cabinet, the two groups of shock wave sensors which are oppositely arranged at the induction ends are triggered in the process that the shock wave is dispersed and spread to the periphery; furthermore, the optical coupler light emitters of the first optical coupler Oc1 and the second optical coupler Oc2 emit light, so that the optical coupler light receivers of the first optical coupler Oc1 and the second optical coupler Oc2 are switched on after receiving a light emitting signal of the optical coupler light emitters, a coil Da of the first power-off time delay relay and a coil Db of the second power-off time delay relay are switched on in a charged mode, further, a normally open contact Das of the first power-off time delay relay and a normally open contact Dbs of the second power-off time delay relay are closed, a closing signal is respectively sent to the microprocessor through the first signal processing mechanism and the second signal processing mechanism, after the microprocessor receives signals that the normally open contact Das of the first power-off time delay relay and the normally open contact Dbs of the second power-off time delay relay are both in a closed state, the time of time delay of 1.5s of a time relay in the transformer 1 backup protection module is skipped, all power circuit breakers connected to the bus are immediately switched, and all bus incoming line power supplies are disconnected, so that further damage to the bus cabinet and equipment in the cabinet is prevented.
It should be noted that: in the process, if the cabinet body of the high-voltage switch cabinet is impacted by external force such as stones, weak shock wave response is generated inside the cabinet body of the high-voltage switch cabinet, and the weak shock wave in the cabinet body of the high-voltage switch cabinet is correspondingly unidirectional because the external force is generally applied in one direction, so that two groups of shock wave sensors which are oppositely arranged at the induction ends cannot be simultaneously triggered; therefore, the arrangement mode that the induction ends are oppositely arranged is adopted, the condition that the shock wave sensor is triggered by mistake can be effectively avoided, the power incoming line breaker is effectively prevented from being broken by mistake, and the economic loss is reduced.
It is also noted that: in the process, if two groups of shock wave sensors cannot be arranged in a one-to-one correspondence manner at opposite positions in two opposite directions due to the limitation of the positions of components in the high-voltage switch cabinet, the second group of shock wave sensors (Db 1 and Db2 … Dbn) can receive shock wave signals only after the first group of shock wave sensors (Da 1 and Da2 … Dan) receive the shock wave signals and disappear, and the situation can also indicate that a problem occurs in a bus chamber of the high-voltage switch cabinet and the trip coil TQ needs to be immediately electrified, so that a first power-off delay relay and a second power-off delay relay are adopted in the invention; the power-off delay relay is characterized by instantaneous action and delayed disconnection, namely after a first group of shock wave sensors (Da 1, Da2 … Dan) receive shock wave signals, a normally open contact Das of the first power-off delay relay is closed, after the first group of shock wave sensors (Da 1, Da2 … Dan) receive the shock wave signals and disappear, the normally open contact Das of the first power-off delay relay is delayed for a period of time and then disconnected, and as long as a second group of shock wave sensors (Db 1, Db2 … Dbn) receive the shock wave signals within the delay time, a microprocessor can receive signals that the normally open contact Das of the first power-off delay relay and the normally open contact Dbs of the second power-off delay relay are both in a closed state, and immediately electrify power incoming line breaker coils TQ on all buses.
Preferably: the delayed power-off time of the first power-off delay relay and the second power-off delay relay is 0.3 s; because the length of the high-voltage switch cabinet is usually not more than 100 meters, and within 0.3 second, the shock wave can be spread by a distance of 100 meters, so that two groups of shock wave sensors in the high-voltage switch cabinet can receive shock wave signals, and the normally open contact Das of the first power-off delay relay and the normally open contact Dbs of the second power-off delay relay can be in a closed state.
Preferably: the shock wave signal generation module further comprises a first signal conditioning mechanism and a second signal conditioning mechanism; the second end of the normally open contact Das of the first power-off delay relay is connected with the first signal processing mechanism through the first signal conditioning mechanism, the second end of the normally open contact Dbs of the second power-off delay relay is connected with the second signal processing mechanism through the second signal conditioning mechanism, and the first signal conditioning mechanism and the second signal conditioning mechanism are respectively composed of a filter circuit, an amplifying circuit and a shaping circuit which are sequentially connected; first signal conditioning mechanism and second signal conditioning mechanism can carry out filtering, enlargies and the plastic to the closed signal of first outage delay relay and second outage delay relay and take care of, guarantee that microprocessor can receive effectual first outage delay relay and second outage delay relay closed signal, and then guarantee tripping coil TQ circular telegram, the power inlet wire circuit breaker tripping operation outage on all generating lines prevents that equipment further damages in generating line cabinet and the cabinet.
Preferably: the trip coil driving module adopts a relay coil driving circuit, and the relay coil driving circuit belongs to the existing mature technology in the field and is not described in detail in the invention.
Preferably: the microprocessor adopts a singlechip, a PLC or an IP core of intellectual property rights.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The shock wave back-locking protection device of the enclosed bus is characterized in that: the device comprises a microprocessor, a shock wave signal generation module and a trip coil driving module; the output end of the shock wave signal generation module is connected with the input end of the microprocessor, and the output end of the microprocessor is connected with the input end of the trip coil driving module and used for controlling the power supply incoming line of the power supply for supplying power to the bus to be electrified through the trip coil driving module;
the shock wave signal generation module comprises a signal generation power supply, a signal acquisition mechanism, a first power-off delay relay, a second power-off delay relay, a first optical coupler, a second optical coupler, a first signal processing mechanism and a second signal processing mechanism; the signal acquisition mechanism comprises two groups of shock wave sensors which are arranged in the high-voltage switch cabinet, wherein the two groups of shock wave sensors comprise a plurality of shock wave sensors with the same number, the two groups of shock wave sensors are respectively arranged on the inner walls of a bus chamber of the high-voltage switch cabinet in two opposite directions, and the induction ends of the two groups of shock wave sensors are arranged oppositely; the first end of the first group of shock wave sensors after being connected in parallel is electrically connected with the anode of the signal generating power supply, the second end of the first group of shock wave sensors after being connected in parallel is electrically connected with the optical coupler light-emitting device and the first resistor of the first optical coupler in sequence and the cathode of the signal generating power supply, the first end of the coil of the first power-off time delay relay is electrically connected with the anode of the signal generating power supply, the second end of the coil of the first power-off time delay relay is electrically connected with the cathode of the signal generating power supply in sequence through the optical coupler light-receiving device and the first resistor of the first optical coupler, the first end of the second group of shock wave sensors after being connected in parallel is electrically connected with the anode of the signal generating power supply, the second end of the second group of shock wave sensors after being connected in parallel is electrically connected with the optical coupler light-emitting device and the second resistor in sequence through the second optical coupler and the cathode of the signal generating, the second end of the coil of the second power-off delay relay sequentially passes through the optical coupler light receiver of the second optical coupler and the second resistor and is electrically connected with the negative electrode of the signal generation power supply, the normally open contact of the coil of the first power-off delay relay is electrically connected with the positive electrode of the signal generation power supply, the second end of the normally open contact of the first power-off delay relay is connected with the input end of the microprocessor through the first signal processing mechanism, the normally open contact of the coil of the second power-off delay relay is electrically connected with the positive electrode of the signal generation power supply, the second end of the normally open contact of the second power-off delay relay is connected with the input end of the microprocessor through the second signal processing mechanism, and the first signal processing mechanism and the second signal processing mechanism both adopt an A/D (analog/digital).
2. The apparatus for shock wave back-lock protection of an enclosed bus bar of claim 1, wherein: and the delayed power-off time of the first power-off delay relay and the second power-off delay relay is 0.3 s.
3. The apparatus for shock wave back-lock protection of an enclosed bus bar of claim 1, wherein: the shock wave signal generation module further comprises a first signal conditioning mechanism and a second signal conditioning mechanism; the second end of the normally open contact of the first power-off delay relay is connected with the first signal processing mechanism through the first signal conditioning mechanism, the second end of the normally open contact of the second power-off delay relay is connected with the second signal processing mechanism through the second signal conditioning mechanism, and the first signal conditioning mechanism and the second signal conditioning mechanism are composed of a filter circuit, an amplifying circuit and a shaping circuit which are sequentially connected.
4. The apparatus for shock wave back-lock protection of an enclosed bus bar of claim 1, wherein: the tripping coil driving module adopts a relay coil driving circuit.
5. The apparatus for shock wave back-lock protection of an enclosed bus bar of claim 1, wherein: the microprocessor adopts a singlechip, a PLC or an IP core of intellectual property rights.
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| CN214124816U (en) * | 2020-11-30 | 2021-09-03 | 国网河南省电力公司灵宝市供电公司 | Shock wave back locking protection device of enclosed bus |
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| CN110311357A (en) * | 2019-06-14 | 2019-10-08 | 国网河南省电力公司灵宝市供电公司 | A kind of Backup Protection Device for Transformer accelerated using nearly bus electric arc |
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| CN112564055B (en) | 2023-04-07 |
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